1. The door window frame installation  should be started in the indoor, and after the external plaster leveling, scraping and other wet work finished.
2. Snap the line:firstly, the center line should be shot out of the window, and the width of the base hole should be determined from the center line. After the door window frame is installed, it should be consistent with the dimension of the wall surface. Both sides of the hole will pop up the same elevation level, and the level of the horizontal line should be the same on the same floor.
3. Installation of the doors and windows frame:According to the position of the elastic line, the door window frame is temporarily fixed with wooden wedge, and the vertical degree and level of the door window frame are repeatedly corrected by using the horizontal ruler and the support line plate, and the wooden wedge is adjusted to the vertical level of the door window frame. In the end, the attachment is fixed on the wall with a fixed pin, and the paper is affixed with protective tape. When the construction is finished, it is strictly prohibited to use the foot board or other heavy objects.
4. The fixed position of the door and window frame and the wall: should be located in the distance between the border angle and the border and the middle frame, the vertical frame of the intersection , the fixed point should not be more than 500mm.
5. The gap between the frames of doors &windows and the wall should be  reserved 5-8mm.The treatment of gap between door and window frame and wall:External doors and windows should be filled with foaming agent and sealed with special seal.The gap between the wooden door frame and the wall should be filled with the mixed mortar.
6. The installation of the window sash:Please install it after the internal and external wall layer and the building floor finished.
7. To ensure the doors and windows frame installed tightly,the connectors should be conformed to the requirement,and should be installed tightly.
As mentioned above,we can see that there are many knowledge in the installation of the doors and windows .In the diary life,pull handles suppliers can learn more about this.